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    Born Lucky: The Genetics of the Four-Leaf Clover

    Each year, from 1913 to 1917, the psychologist Edmund S. Conklin would hand out a questionnaire to his new psychology students. Conklin wanted to see which superstitious habits or beliefs were the most and least enduring. He found that just over a quarter of college students believed in lucky four-leaf clovers, making it the second […]